Hey @upgiant according to HubSpot’s Knowledge Base on October 15th, 2015 the HubSpot CRM - Google Drive integration was sunsetted.
However I know that the HubSpot CRM does support Zapier integrations. Zapier uses triggers and actions to automate work between HubSpot and other apps, including Google Docs!
Here a page explaining how you can integrate Google Docs and HubSpot. For full details on how to use Zapier and HubSpot check out this knowledege article: How to use Zapier and HubSpot.